CVE-2019-16018 : A vulnerability in the implementation of Border Gateway Protocol (BGP) Ethernet

A vulnerability in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of a BGP update message that contains crafted EVPN attributes. An attacker could indirectly exploit the vulnerability by sending BGP EVPN update messages with a specific, malformed attribute to an affected system and waiting for a user on the device to display the EVPN operational routes’ status. If successful, the attacker could cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit this vulnerability, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.

Published 2020-01-26 05:15:14

Updated 2020-02-03 20:03:12

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2019-16018

Cisco » Ios Xr » Version: 6.6.1
cpe:2.3:o:cisco:ios_xr:6.6.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 9000v » Version: N/A For X64
When used together with: Cisco » Asr 9001 » Version: N/A For X64
When used together with: Cisco » Asr 9006 » Version: N/A For X64
When used together with: Cisco » Asr 9010 » Version: N/A For X64
When used together with: Cisco » Asr 9901 » Version: N/A For X64
When used together with: Cisco » Asr 9904 » Version: N/A For X64
When used together with: Cisco » Asr 9906 » Version: N/A For X64
When used together with: Cisco » Asr 9910 » Version: N/A For X64
When used together with: Cisco » Asr 9912 » Version: N/A For X64
When used together with: Cisco » Asr 9922 » Version: N/A For X64
When used together with: Cisco » Ncs 540 » Version: N/A
When used together with: Cisco » Ncs 5501 » Version: N/A
When used together with: Cisco » Ncs 5501-se » Version: N/A
When used together with: Cisco » Ncs 5502 » Version: N/A
When used together with: Cisco » Ncs 5502-se » Version: N/A
When used together with: Cisco » Ncs 5508 » Version: N/A
When used together with: Cisco » Ncs 5516 » Version: N/A
When used together with: Cisco » Ncs 6000 » Version: N/A
Cisco » Ios Xr » Version: 6.6.2
cpe:2.3:o:cisco:ios_xr:6.6.2:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 9000v » Version: N/A
When used together with: Cisco » Asr 9000v » Version: N/A For X64
When used together with: Cisco » Asr 9001 » Version: N/A
When used together with: Cisco » Asr 9001 » Version: N/A For X64
When used together with: Cisco » Asr 9006 » Version: N/A
When used together with: Cisco » Asr 9006 » Version: N/A For X64
When used together with: Cisco » Asr 9010 » Version: N/A
When used together with: Cisco » Asr 9010 » Version: N/A For X64
When used together with: Cisco » Asr 9901 » Version: N/A
When used together with: Cisco » Asr 9901 » Version: N/A For X64
When used together with: Cisco » Asr 9904 » Version: N/A
When used together with: Cisco » Asr 9904 » Version: N/A For X64
When used together with: Cisco » Asr 9906 » Version: N/A
When used together with: Cisco » Asr 9906 » Version: N/A For X64
When used together with: Cisco » Asr 9910 » Version: N/A
When used together with: Cisco » Asr 9910 » Version: N/A For X64
When used together with: Cisco » Asr 9912 » Version: N/A
When used together with: Cisco » Asr 9912 » Version: N/A For X64
When used together with: Cisco » Asr 9922 » Version: N/A
When used together with: Cisco » Asr 9922 » Version: N/A For X64
When used together with: Cisco » CRS » Version: N/A
When used together with: Cisco » Ncs 5501 » Version: N/A
When used together with: Cisco » Ncs 5501-se » Version: N/A
When used together with: Cisco » Ncs 5502 » Version: N/A
When used together with: Cisco » Ncs 5502-se » Version: N/A
When used together with: Cisco » Ncs 5508 » Version: N/A
When used together with: Cisco » Ncs 5516 » Version: N/A
When used together with: Cisco » Xrv 9000 » Version: N/A
Cisco » Ios Xr » Version: 6.6.25
cpe:2.3:o:cisco:ios_xr:6.6.25:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Ncs 540 » Version: N/A
When used together with: Cisco » Ncs 540l » Version: N/A
When used together with: Cisco » Ncs 5501 » Version: N/A
When used together with: Cisco » Ncs 5501-se » Version: N/A
When used together with: Cisco » Ncs 5502 » Version: N/A
When used together with: Cisco » Ncs 5502-se » Version: N/A
When used together with: Cisco » Ncs 5508 » Version: N/A
When used together with: Cisco » Ncs 5516 » Version: N/A
When used together with: Cisco » Ncs 560 » Version: N/A
When used together with: Cisco » Ncs 6000 » Version: N/A
Cisco » Ios Xr » Version: 7.0.1
cpe:2.3:o:cisco:ios_xr:7.0.1:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asr 9000v » Version: N/A For X64
When used together with: Cisco » Asr 9001 » Version: N/A For X64
When used together with: Cisco » Asr 9006 » Version: N/A For X64
When used together with: Cisco » Asr 9010 » Version: N/A For X64
When used together with: Cisco » Asr 9901 » Version: N/A For X64
When used together with: Cisco » Asr 9904 » Version: N/A For X64
When used together with: Cisco » Asr 9906 » Version: N/A For X64
When used together with: Cisco » Asr 9910 » Version: N/A For X64
When used together with: Cisco » Asr 9912 » Version: N/A For X64
When used together with: Cisco » Asr 9922 » Version: N/A For X64
When used together with: Cisco » Ncs 1001 » Version: N/A
When used together with: Cisco » Ncs 1002 » Version: N/A
When used together with: Cisco » Ncs 1004 » Version: N/A
When used together with: Cisco » Ncs 5001 » Version: N/A
When used together with: Cisco » Ncs 5002 » Version: N/A
When used together with: Cisco » Ncs 540 » Version: N/A
When used together with: Cisco » Ncs 540l » Version: N/A
When used together with: Cisco » Ncs 5501 » Version: N/A
When used together with: Cisco » Ncs 5501-se » Version: N/A
When used together with: Cisco » Ncs 5502 » Version: N/A
When used together with: Cisco » Ncs 5502-se » Version: N/A
When used together with: Cisco » Ncs 5508 » Version: N/A
When used together with: Cisco » Ncs 5516 » Version: N/A
When used together with: Cisco » Ncs 560 » Version: N/A
When used together with: Cisco » Ncs 6000 » Version: N/A
When used together with: Cisco » Xrv 9000 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2019-16018

EPSS FAQ

0.14%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 49 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-16018

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:N/A:P	8.6	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
7.4	HIGH	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H	2.8	4.0	Cisco Systems, Inc.
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Changed Confidentiality: None Integrity: None Availability: High
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	2.8	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2019-16018

CWE-399

Assigned by: ykramarz@cisco.com (Secondary)
CWE-400 Uncontrolled Resource Consumption

The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2019-16018

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20200122-ios-xr-routes

Cisco IOS XR Software BGP EVPN Operational Routes Denial of Service Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2019-16018

Products affected by CVE-2019-16018

Exploit prediction scoring system (EPSS) score for CVE-2019-16018

CVSS scores for CVE-2019-16018

CWE ids for CVE-2019-16018

References for CVE-2019-16018